题目
Remove all elements from a linked list of integers that have value val.
Example
Given: 1 –> 2 –> 6 –> 3 –> 4 –> 5 –> 6, val = 6
Return: 1 –> 2 –> 3 –> 4 –> 5
思路
链表节点的删除操作。
代码
#include <iostream>
#include <vector>
using namespace std;
struct ListNode{
int val;
ListNode *next;
ListNode(int x):val(x),next(nullptr){}
};
class Solution {
public:
ListNode* removeElements(ListNode* head, int val) {
if(head == nullptr){
return nullptr;
}
ListNode *dummy = new ListNode(0);
dummy->next = head;
ListNode* pre = dummy;
ListNode* cur = head;
ListNode* tmp;
while(cur){
if(cur->val == val){
tmp = cur;
pre->next = cur->next;
delete tmp;
cur = pre->next;
}
else{
pre = cur;
cur = cur->next;
}
}
return dummy->next;
}
};
int main() {
Solution solution;
ListNode* head = new ListNode(1);
ListNode* node1 = new ListNode(5);
ListNode* node2 = new ListNode(2);
ListNode* node3 = new ListNode(1);
ListNode* node4 = new ListNode(4);
ListNode* node5 = new ListNode(1);
head->next = node1;
node1->next = node2;
node2->next = node3;
node3->next = node4;
node4->next = node5;
head = solution.removeElements(head,6);
while(head){
cout<<head->val<<endl;
head = head->next;
}
}
运行时间
<script type="text/javascript">
$(function () {
$('pre.prettyprint code').each(function () {
var lines = $(this).text().split('\n').length;
var $numbering = $('<ul/>').addClass('pre-numbering').hide();
$(this).addClass('has-numbering').parent().append($numbering);
for (i = 1; i <= lines; i++) {
$numbering.append($('<li/>').text(i));
};
$numbering.fadeIn(1700);
});
});
</script>
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